Why light from TV’s display doesn’t project it’s image on surfaces like projector?
In: Physics
The light bulb in a projector is way more powerful than the individual pixels that make up an LCD or OLED screen. It shines through the imaging chip, picking up the colors and image and hits a lens, which concentrates it further into a coherent beam of light. Then the light travels a few feet and hits the wall, or screen. As it travels from the lens it will spread out and become less coherent, losing its luminescence, or brightness. The further it goes the larger it gets but also the less focused and bright.
The same thing actually happens with light from pixels but since it’s much less bright it loses coherence that much faster. And since there’s no lenses to focus the light it spreads out in every direction. But it’s mainly the combination of very powerful light bulb and a lens to focus the image that allows us s to project a detailed image onto a surface.
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